How to use outline in css-CSS Tutorial-php.cn

The outline property is used in CSS to create a border around an element to highlight focus or status. It is different from the border property in that it does not take up space on the element, is automatically displayed when the element gets focus, and the color and style can be set independently. The syntax is as follows: outline: ; Usage includes highlighting selected elements, indicating input focus, creating visual separation and debugging element layout.

Usage of outline in CSS

outline attribute is used in CSS for elements Creates a border around it to highlight its focus or status. It is similar to the border property, but has some important differences:

differs from the border property

outline Does not take up element space, just visual effect. outline is automatically displayed when the element is фокус, while border is always visible. The color and style of outline can be set independently, while the color and style of border are usually the same as the style of the element itself. Syntax

outline The syntax of the attribute is as follows:

outline: ; Copy after login Among them,

color Specifies the color of the outline. style Specifies the line style for the outline (for example, dotted, dashed, solid). width Specifies the width of the outline. Usage

outline The attribute can be applied in the following ways:

Highlight Selected elements: When an element is selected, you can make it stand out by setting the outline attribute for it. Indicate input focus: When an element receives input focus, an outline can be displayed to indicate that it is being edited. Create visual separators: You can use outline to create visual separators around elements to make them more visible on the page. Debugging element layout: When debugging element layout, you can temporarily use outline to view the bounds of an element to help identify overlap or spacing issues. Example

The following example shows how to use the outline attribute to highlight a selected button:

button:focus { outline: 2px solid red; } Copy after login When When a button has focus, it displays a 2-pixel-wide red outline .